JP3563685B2 - Car seat back - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automobile seatback, and more particularly to a structure of an automobile seatback that protects a cervical vertebra of a vehicle occupant when the vehicle is hit by another vehicle.
[0002]
[Prior art]
As such a conventional vehicle seat back, for example, as disclosed in Japanese Patent Application Laid-Open No. H10-119919, a lateral frame member having a rotating hinge is provided at a front side of an upper end portion of a side frame, and a pressure receiving member accompanying a rear-end collision is provided. Have.
[0003]
For this reason, for example, when the own vehicle is collided, an impact load (primary collision) is applied to the seat back toward the front side first, and then a reaction load (secondary load) due to the occupant's body itself is applied. Collision) acts toward the rear. That is, the load acts on the pressure receiving member. At this time, the pressure receiving member is moved to the rear side, whereby the horizontal frame member rotates forward around the front rotation hinge, and the headrest supported by the horizontal frame member becomes a portion corresponding to the head of the occupant. By moving, the headrest operates in a direction approaching the occupant's head.
[0004]
Therefore, even if the seatback flexes rearward due to the reaction load of the vehicle occupant when the vehicle collides, the pressure receiving member instantaneously operates the headrest by the principle of leverage and approaches the occupant's head by the reaction load. Therefore, the head of the occupant is securely received by the headrest, and the cervical vertebra of the occupant is protected.
[0005]
[Problems to be solved by the invention]
However, in such a conventional technique, the standing stop position and the front rotation stop position of the horizontal frame member are stopped at the respective positions by different stopper means, so that one of the causes of the cost increase may be caused. And improvement is desired. In addition, since the stoppers are separate, it is difficult to achieve high positional accuracy, and improvement is required also in this respect.
[0006]
The present invention has been made by paying attention to such a conventional technique, and provides an automobile seat back in which the same stopper means determines the upright stop position and the front rotation stop position of the headrest.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a seatback frame having at least side frames on both sides and an upper cross member fixedly installed between the upper ends of the side frames, and between the upper ends of the side frames. A headrest support member erected rotatably back and forth, a pressure receiving member supported by the headrest support member and arranged at a position capable of receiving an impact load accompanying a rear-end collision, and supported by the headrest support member. A headrest supported movably up and down by a headrest holder, wherein the upper cross member is provided between a lower end of the headrest support member and the pressure receiving member. A stopper surface interposed therebetween is formed, and the head surface is formed on the stopper surface. Stopper means is disposed toward the side of said pressure receiving member and the lower end of the strike the support member.
[0008]
According to the first aspect of the present invention, the stopper surface of the upper cross member is interposed between the lower end portion of the headrest support member and the pressure receiving member, and the stopper surface has the lower end portion of the headrest support member. Since the stopper means is provided on both sides of the pressure receiving member, the standing stop position and the front rotation stop position of the headrest are determined by one stopper means, so that the manufacturing cost is reduced. In addition, positional accuracy can be easily obtained.
[0009]
The invention according to claim 2 is the automobile seat back according to claim 1, wherein the stopper means stops at any surface of the lower end portion of the headrest support member and the pressure receiving member. , And one of the stop portions is supported by the stopper surface.
[0010]
According to the invention described in claim 2, the stopper means forms a stop portion on both sides of the stopper surface, and one of the stop portions is supported by the stopper surface. Since the two stoppers have the function of stopping the two surfaces and one of the surfaces is supported by the stopper surface, the supporting means can also be used.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that FR is described as a front side, RR is a rear side, UP is an upper side, and LWR is a lower side.
[0012]
1 to 5 show an embodiment of the present invention, in which reference numeral 1 denotes an automobile seat back, and reference numeral 3 denotes a headrest.
[0013]
The seat back 1 includes a seat back frame 4, a headrest support member 7, a pressure receiving member 8, and a headrest holder 9.
[0014]
The seat back frame 4 has a cross-sectional shape of a substantially horizontal cross-section between iron-made side frames 2 and 2 disposed on both sides and front FRs of upper ends 2 a and 2 a of the side frames 2. An upper cross member 10 made of a U-shaped iron plate and a lower cross member 11 made of an iron plate, which is installed substantially horizontally at lower ends 2b, 2b of the side frames 2, respectively. And the lower cross member 11 are mutually supported by the welding GW.
[0015]
Between the side frames 2, a tension spring 12 that does not bend during normal use and an S-shaped spring 35 that can bend under the load during normal use to improve the riding comfort of an occupant are provided. The tension spring 12 is provided directly on the side frame 2, and the S-shaped spring 35 is provided on the side frame 2 via the clips 17, 17.
[0016]
The pressure receiving member 8 includes a straight portion 14 fixedly suspended by welding GW on a front surface FR at a central portion of the rear surface portion 7b of the headrest support member 7 in the left-right direction and a lower end of the straight portion 14. It comprises a curved portion 14a that is hung down from a position slightly bent forward from the portion, and has a substantially I-shape in front view when squashed front and rear. A rear portion of the boundary between the straight portion 14 and the curved portion 14a has a bent portion 20 that is bent in a "-" shape on the front side in a side view shown in FIG. The position at which the pressure receiving member 8 is disposed is a position at which the occupant leaning on the seat back 1 can receive a secondary impact load accompanying a rear-end collision.
[0017]
A pressure receiving portion 15 made of a synthetic resin is disposed at a lower end portion 8a of the pressure receiving member 8 so as to cover the lower end portion 8a of the pressure receiving member 8. The tension spring 12 is engaged, and the lower end 8a of the pressure receiving member 8 is constantly urged toward the front side FR. That is, a rear surface portion 7b described later of the headrest support member 7 is constantly urged in a direction in which it comes into contact with a stopper surface 10a described later of the upper cross member 10. Since the surface on the rear side RR of the pressure receiving portion 15 is formed as a smooth surface having little frictional resistance, the tension spring 12 can slide up and down on the smooth surface.
[0018]
The tension spring 12 is formed in a wire shape, and may have a cross section of a substantially perfect circle or a substantially regular polygon, as long as it can rotate itself. Further, the coil spring 12a is interposed between the tension spring 12 at two places so that the tension spring 12 has a "spring force" which does not extend under a sitting load of an occupant (not shown) but can be extended only by a secondary impact load caused by a rear-end collision. Do it.
[0019]
The headrest support member 7 is made of an iron plate, extends left and right, and has an upper surface portion 7a and a rear surface portion 7b bent at a right angle to form an inverted L-shaped cross section. The headrest support member 7 has support portions 7c, 7c formed by bending right and left ends of the headrest support member 7 from the rear surfaces 7b, 7b to the front side FR, and the upper ends of the side frames 2, 2 of the seat back frame 4. The parts 2a, 2a are rotatably supported in the front and rear FR, RR by a stepped bolt 5 and a bush 6 for absorbing rubbing noise and shock during rotation. As shown in FIG. 5, upper and lower through holes 19, 19 through which the headrest holder 9 is inserted and supported are formed in the upper surface portion 7a itself and the bracket 7d projecting from the rear surface portion 7b. Be done.
[0020]
As shown in FIGS. 1, 2, and 5, the upper cross member 10 is made of an iron plate, extends left and right, and is formed integrally with an upper surface portion 10b and a stopper surface 10a. The upper surface portion 10b has a U-shaped cross section in which the front side FR is closed and the rear side RR is opened. The stopper surface 10a is formed in a wall shape from below the upper surface portion 10b. In a bent portion between the stopper surface 10a and the upper surface portion 10b, a long hole 10c is formed before and after the linear portion 14 of the pressure receiving member 8 can be inserted and moved. Notches 10d and 10d are formed in the upper surface 10b to prevent interference with the stay 13 of the headrest 3.
[0021]
As shown in FIG. 3, a lower end portion 7e of a rear surface portion 7b of the headrest support member 7 is hung down to a position facing a stopper surface 10a hung from the upper cross member 10, and is disposed on the stopper surface 10a. The lower end portion 7e of the rear surface portion 7b of the headrest support member 7 collides with the first buffer portion 16a which is the "stop portion" of the buffer member 16 which is the "stopper means" as shown in FIG. Further movement is stopped. That is, the rotation preventing position of the headrest support member 7 itself to the rear side RR is specified.
[0022]
A linear portion 14 of the pressure receiving member 8 is supported on a rear surface portion 7b of the headrest support member 7. As the headrest support member 7 rotates, the pressure receiving member 8 is attached to a stopper surface 10a of the upper cross member 10. When approaching, as shown in FIG. 7, the rear surface of the pressure receiving member 8 collides with the second buffer portion 16b which is the "stop portion" of the buffer member 16 disposed on the stopper surface 10a, and Movement is stopped. That is, the rotation stop position of the headrest support member 7 itself to the front side FR is specified. The second buffer section 16b is also a means for supporting the buffer member 16 on the stopper surface 10a.
[0023]
The headrest holder 9 is a member made of a synthetic resin that is supported by being engaged with upper and lower through holes 19 of the headrest support member 7 and that holds the stay 13 of the headrest 3. The headrest holder 9 has a well-known stopper mechanism that can move the stay 13 up and down as appropriate and can stop at an appropriate position.
[0024]
The straight portion 14 has a vertical shape when viewed from the front, and the holding position of the straight portion 14 is on the rear side RR of the upper cross member 10. , The shoulder point of the occupant does not interfere with the linear portion 14 even if the occupant is pressed against the seat back 1 from the front FR.
[0025]
The pressure receiving member 8 is installed at a position near the back of an occupant (not shown), and is formed to be flat toward the front side FR and thinly crushed into the front and rear FR, RR, so that the pressure receiving member 8 has a predetermined width up and down. Having.
[0026]
Next, the operation according to this embodiment will be described.
[0027]
The seat back 1 is always in the state shown in FIGS. That is, since the pressure receiving portion 15 of the lower end portion 8a of the pressure receiving member 8 is pressed against the front side FR by the tension spring 12, the rear surface portion 7b of the headrest support member 7 supporting the pressure receiving member 8 is moved to the "stop portion" of the cushioning member 16. The headrest 3 is held via a headrest holder 9 supported by the headrest support member 7 in contact with the stopper surface 10a of the upper cross member 10 via the first buffer portion 16a.
[0028]
In a driving state in which an occupant sits on a seat cushion composed of the seat back 1 and a seat cushion (not shown) in this state, and does not lean against the back of the seat back 1, for example, between the occupant's head and the headrest 3. Has a gap, and a gap is also formed between the occupant's back and the pressure receiving member 8. However, a pad, a skin member, and the like (not shown) are interposed between the back of the occupant and the pressure receiving member 8 so that they are in close contact with each other. Further, when the occupant leans against the seat back 1 in a relaxed state when seated, the pad and the S-shaped spring 35 bend due to the load applied from the occupant's back, so that the occupant's back can be softly received. In state. Therefore, the seating feeling is good. Of course, no load is applied to the pressure receiving member 8.
[0029]
In this state, when the own vehicle collides, firstly, an impact load is applied to the front FR, and the occupant receives a load in a direction of being thrown from the seat back 1 to the front FR. Next, a load moved to the rear side RR, that is, a secondary impact load (referred to as a secondary collision) is applied to the occupant. Since the impact value associated with such a secondary collision is equal to or greater than the load at which the coil spring 12a of the tension spring 12 starts to expand, as the coil spring 12a of the tension spring 12 expands, 15 is moved to the rear side RR.
[0030]
As the lower end portion of the pressure receiving member 8 moves to the rear side RR, the support portions 7c of the headrest support member 7 center on the stepped bolt 5 and the bush 6, as shown in FIGS. Rotate to FR. The headrest holder 9 supported by the headrest support member 7 rotates to the front FR together with the headrest support member 7, and the stay 13 supported by the headrest holder 9 is controlled to rotate to the front FR together with the headrest 3. By moving to the rear side RR of the occupant's head, the occupant's head can be securely held, thereby protecting the neck. Such rotation control is of course performed instantaneously.
[0031]
Further, the rotation center 3a of the headrest 3 is coaxial with the stepped bolt 5 provided on the side frames 2 and 2, and the arrangement position of the stepped bolt 5 is the rear side RR of the seat back 1. Therefore, it does not interfere with the occupant seated on the front side FR of the seat back 1, and consequently does not give a foreign-body sensation. Further, when a load due to a secondary collision of the occupant is applied to the pressure receiving member 8, the pressure receiving member 8 rotates about the upper end portions 2a, 2a of the side frames 2, 2, so that it does not easily interfere with the occupant's shoulder. In position. That is, the headrest 3 can be moved to the front FR by that amount, and the occupant's neck can be reliably held.
[0032]
Also, since the shoulder point of the occupant is at least the shoulder point of the AF05% tile mannequin, the pad (not shown) of the seat back 1 does not bite into the linear portion 14 of the pressure receiving member 8, so the linear portion 14 is formed on the rear surface of the pad. Can be smoothly moved, and the UP of the pad caused by the rotation of the linear portion 14 is not hindered, so that the operation amount of the headrest 3 can be sufficiently secured.
[0033]
In this way, the back of the occupant moves to the rear side RR due to the impact, so that the head of the occupant, which is supposed to be left behind, is reliably held by the movement of the headrest 3 to the front side FR. . Moreover, in this state, since the bent portion 20, which is the lower end portion of the linear portion 14, is bent in the shape of a "ku" on the front side, when the pressure receiving member 8 moves to the rear side RR, the pressure receiving member 8 The space with the rear occupant is secured without protruding to the rear side RR.
[0034]
Further, since the stays 13, 13 of the headrest 3 are vertically movably supported by the headrest holder 9, the headrest 3 can be appropriately adjusted to the position of the head of an occupant having a different physique.
[0035]
Further, since the seat back 1 is formed in a square shape by the side frames 2 and 2, the upper cross member 10 and the lower cross member 11, the strength of the seat back 1 is remarkably improved, and the pressure receiving member 8 which receives the secondary collision. There is no problem that the headrest support member 7 that supports is deformed.
[0036]
Further, the pressure receiving member 8 is urged to the front side FR by the tension spring 12 and does not expand under a sitting load but can be expanded only by an impact load accompanying a rear-end collision, so that the occupant can normally sit and relax in a normal state. In this case, the coil spring 12a of the tension spring 12 does not extend in response to the backrest load of the occupant's back, and the occupant's back can be comfortably held by the S-shaped spring 35. Further, when a load due to a secondary collision due to a rear-end collision is applied, the coil spring 12a of the tension spring 12 can be extended, so that there is no hindrance to the movement of the pressure receiving member 8, and the movement can be surely performed. it can.
[0037]
When the headrest 3 rotates to the front side FR due to the secondary collision and becomes capable of protecting the occupant's neck, the second cushioning portion 16b of the cushioning member 16 supported by the stopper surface 10a of the upper cross member 10 When the pressure receiving member 8 supported by the headrest support member 7 collides with the headrest 3, the rotation angle of the headrest 3 toward the front side FR can be limited, so that the occurrence of an abnormal rotation of the headrest 3 toward the front side FR is prevented. You. In other words, the upright stop position and the front rotation stop position of the headrest 3 are determined by one buffer member 16, so that the manufacturing cost is reduced. In addition, positional accuracy can be easily obtained.
[0038]
The buffer member 16 has first and second buffer portions 16a and 16b formed on both surfaces of the stopper surface 10a. Of the first and second buffer portions 16a and 16b, the second buffer portion 16b is formed. Are engaged and supported via through holes formed in the stopper surface 10a, so that one buffer member 16 has a function of stopping two surfaces and one of the surfaces is supported by the stopper surface 10a. Therefore, the supporting means can also be used.
[0039]
Further, since the tension spring 12 is slidable up and down along the pressure receiving member 8, the stress of the tension spring 12 is reduced, the reaction force is reduced, and the rotation of the headrest support member 7 becomes smoother.
[0040]
Since the pressure receiving portion 15 of the pressure receiving member 8 is made of a synthetic resin, the tension spring 12 can smoothly move up and down when sliding, and no rubbing noise is generated.
[0041]
Since the pressure receiving member 8 corresponding to the back of the occupant, which is a position where the impact load accompanying the rear-end collision can be received, is substantially I-shaped when viewed from the front, there is no protrusion, and accordingly, the pressure receiving operation plate and the like are not provided. It is unnecessary, is inexpensive, and has only one pressure receiving member 8, so that significant weight reduction can be achieved.
[0042]
In the above description of operation, it is assumed that the head of the occupant is securely held by the movement of the headrest 3, but the movement of the headrest 3 and the movement of the seat back 1 are relative, and the back of the occupant is It is described that even if the seat back 1 moves to the rear side RR, the headrest 3 does not move with respect to the head of the occupant and is held at that position, thereby protecting the occupant's head. It also includes things.
[0043]
【The invention's effect】
According to the first aspect of the present invention, the stopper surface of the upper cross member is interposed between the lower end portion of the headrest support member and the pressure receiving member, and the stopper surface has the lower end portion of the headrest support member. Since the stopper means is provided on both sides of the pressure receiving member, the standing stop position and the front rotation stop position of the headrest are determined by one stopper means, so that the manufacturing cost is reduced. In addition, positional accuracy can be easily obtained.
[0044]
According to the invention described in claim 2, the stopper means forms a stop portion on both sides of the stopper surface, and one of the stop portions is supported by the stopper surface. Since the two stoppers have the function of stopping the two surfaces and one of the surfaces is supported by the stopper surface, the supporting means can also be used.
[Brief description of the drawings]
FIG. 1 is a side view showing a seat back according to an embodiment of the present invention.
FIG. 2 is an enlarged side view of FIG.
FIG. 3 is an enlarged sectional view of a main part of FIG. 2;
FIG. 4 is a front view of FIG. 1;
FIG. 5 is an exploded perspective view of FIGS. 1 and 4;
FIG. 6 is a side view after the operation of FIG. 1;
FIG. 7 is an enlarged sectional view of a main part of FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat back 2 Side frame 2a Upper end 3 of side frame 3 Headrest 4 Seat back frame 5, 6 Rotating hinge 7 Headrest support member 7e Lower end of headrest support member 8 Pressure receiving member 9 Headrest holder 10 Upper cross member 10a Upper cross member stopper Surface 12 Tension spring 16 Buffer member (stopper means)
16a 1st buffer part (stop part)
16b 2nd buffer part (stop part)
FR Front RR Rear UP Upper LWR Lower

Claims (2)

A seat back frame having at least side frames on both sides and an upper cross member fixedly installed between upper ends of the side frames; and a seat back frame installed between upper ends of the side frames so as to be rotatable back and forth. A headrest support member, a pressure-receiving member supported by the headrest support member and arranged at a position capable of receiving an impact load accompanying a rear-end collision, and a headrest holder supported by the headrest support member so as to be vertically movable. An automotive seat back comprising at least a headrest and at least a
The upper cross member has a stopper surface formed between the lower end portion of the headrest support member and the pressure receiving member, and the lower end portion of the headrest support member, the pressure reception member, A seat back for an automobile, wherein stopper means are provided on both sides of the seat back. The vehicle seat back according to claim 1,
The stopper means is arranged such that a stop portion faces any surface of the lower end portion of the headrest support member and the surface of the pressure receiving member, and one of the stop portions is supported by the stopper surface. An automobile seat back characterized by being made.

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